Evaluation of different methods for extraction of nanocellulose from yerba mate residues

Marcos Aurélio Dahlem Júnior; Cleide Borsoi; Betina Hansen; André Luís Catto

doi:10.1016/j.carbpol.2019.04.064

Evaluation of different methods for extraction of nanocellulose from yerba mate residues

Carbohydr Polym. 2019 Aug 15:218:78-86. doi: 10.1016/j.carbpol.2019.04.064. Epub 2019 Apr 25.

Authors

Marcos Aurélio Dahlem Júnior¹, Cleide Borsoi², Betina Hansen³, André Luís Catto⁴

Affiliations

¹ Centro de Ciências Exatas e Tecnológicas, Universidade do Vale do Taquari - Univates, Lajeado, RS, Brazil. Electronic address: marcosdahlem@gmail.com.
² Centro de Ciências Exatas e Tecnológicas, Universidade do Vale do Taquari - Univates, Lajeado, RS, Brazil. Electronic address: eng.cleide@yahoo.com.br.
³ Centro de Ciências Exatas e Tecnológicas, Universidade do Vale do Taquari - Univates, Lajeado, RS, Brazil. Electronic address: betina.hansen03@gmail.com.
⁴ Centro de Ciências Exatas e Tecnológicas, Universidade do Vale do Taquari - Univates, Lajeado, RS, Brazil. Electronic address: andrecatto@terra.com.br.

PMID: 31221346
DOI: 10.1016/j.carbpol.2019.04.064

Abstract

In this work, we evaluate the production of nanocellulose from yerba mate sticks (YMS) using soft chemical and steam explosion treatments. The nanocellulose is characterized by chemical characterization, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), dynamic light scattering (DLS), transmission electron microscopy (TEM) and atomic force microscopy (AFM). The main results showed that after the chemical treatment and steam explosion, the YMS fiber reached diameters of 11-15 nm and aspect ratios (L/D) of 12-24. The XRD results showed that there is an increase in the index of crystallinity of up to 35% when compared to raw YMS. We discover that it is possible to obtain cellulose nanofibers (CNF) from the YMS without the use of alkaline treatment, which reduces the generation of liquid waste. Thus, the production of CNF by means of acid hydrolysis, bleaching and steam explosion represents an alternative route.

Keywords: Cellulose nanofiber; Characterization; Chemical treatment; Steam explosion.